研究目的
Investigating the performance of TiO2-B2O3 gas sensor in detecting hydrogen at different operating temperatures.
研究成果
The TiO2-B2O3 gas sensor demonstrated the ability to detect low concentrations of hydrogen, with optimal performance at an operating temperature of 200°C. The sensor exhibited p-type response, with sensitivity values improving with increased hydrogen concentration and operating temperature.
研究不足
The gas sensor showed no response to 100 ppm of hydrogen at 100°C, indicating a limitation in sensitivity at lower temperatures. The study suggests that higher operating temperatures improve sensor performance.
1：Experimental Design and Method Selection:
The study involved the preparation of TiO2-B2O3 gas sensor by mixing TiO2-B2O3 with an organic binder, followed by annealing using nitrogen at 650°C for 30 minutes. The sensing film was characterized using FESEM and XRD.
2：Sample Selection and Data Sources:
The gas sensor was exposed to hydrogen concentrations of 100 - 1000 ppm at operating temperatures of 100°C and 200°C.
3：List of Experimental Equipment and Materials:
Equipment included FESEM, XRD, mass flow controller, temperature controller, and Kiethley 487 Picoammeter / Voltage source. Materials included TiO2 (P25), Boron Oxide (B2O3), alumina substrate, silver paste, and organic binder.
4：Experimental Procedures and Operational Workflow:
The sensing film was prepared, characterized, and then tested for hydrogen detection at specified temperatures and concentrations.
5：Data Analysis Methods:
The sensitivity of the gas sensor was calculated based on resistance changes when exposed to hydrogen.
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